Hi All,
I poured my insulating layer of vermiculite and Portland cement about four days ago. It feels a little spongy on the edges...Is this normal?
thanks,
Dave

Breven

10-28-2009 11:20 AM

Re: spongy insulating layer

I think that is proabbly normal. I noticed the edges were a bit fragile on mine as well. The brick floor will displace the weight evenly over the entire insulating layer...should be real sturdy. Of course, that is assuming you used the correct vermiculite/cement ratio.

dmun

10-28-2009 03:49 PM

Re: spongy insulating layer

Quote:

I poured my insulating layer of vermiculite and Portland cement about four days ago. It feels a little spongy on the edges...Is this normal?

This is normal, it takes a week to harden to the cork-like consistency, and it still will be crumbly around the edges.

Neil2

10-30-2009 04:51 PM

Re: spongy insulating layer

Yep, normal.

Everyone reports it as looking "spongy" but it will support a surprising load.